Telephone-transmitter



(No Model.)

B. L. WILSON.

TELEPHONE TRANSMITTER.

m ,a w L? 1 0 0 40% n d M W W m jw m D1 UNiTED STATES ATENT Orricn.

EDWARD L. WILSON, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE AMERICANBELL TELEPHONE COMPANY, OF MASSACHUSETTS.

TELEPHONE-TRANSMITTER.

SPECIFICATION formingpart of Letters PatentNo. 287,490, dated October50, 1883.

Application filed June 4, 1883. (No model.) d

To all whom it may concern.-

Be it known that I, EDWARD L. WILsoN, of Boston, in the county ofSuffolk and State of Massachusetts, have invented certain Improvementsin TelephoneTransmitters, of which the following is a specification.

My invention is an improvement in the construction of battery-telephonessuch as are in common use as transmitters.

It is well known that owing to the delicacy of many of the instrumentswhich are used in the transmission and reproduction of articulate speechthey require careful attention and supervision, and in carrying this outit is frequently essential that the respective parts have to be takenfrom one another and cleaned or repaired severally.

The object of this invention is to so construct such instruments that byavery simple operation they may be taken apart for inspection andrepairs, and upon the completion of such inspection be put togetheragain, by persons unskilled in electromechanical science, and withoutthe intermediation of special tools.

To this end it consists in certain specific details of construction,which co-operate with one another, so that when all the parts are inplace they are mutually held together, and whereby if one of the saidparts be severed the entire combination is disintegrated.

In the drawings which illustrate and form a part of this specification Ishow a Blake transmitter and a modification thereof constructed inaccordance with my invention. Figure 1 is a rear view of the saidmodification; Fig. 2, a side elevation, and Figs. 3 and 4 detailsthereof. Fig. 5 is a rear view of the working parts of a Blaketransmitter provided with my invention, and Fig. 6 a sectional elevationof the same. I

In Figs. 1 and 2, A is a metal bed-plate or ring-seat, in which liesloosely a vibratory diaphragm, B. Fastened by screws (Z to the top andbottom part of the bed-plate-are metal standards 0 and O. A bracket, a,projects from the upper standard, 0, and at its outer end is forked, asshown in Fig. 1, the forked end being bent under and inwardly. The upperstandard also has a projecting lug, c, for a purpose which willhereinafter appear. A metal bar, an edge View of which is shown in Fig.3, is provided at its upper end with an axis, Z, adapted to fit into thebend of the light metallic bracket a, whereby the bar may be suspendedtherefrom. A little below this axis the bar is also provided with aninwardly-proj ecting lug, c, which, when the said bar is suspended byits axis, presses against the stand.

The lower standard, 0, is slotted,

ard-lug c.

and a bolt, 6, is pivoted in the slot by a pivot-.

The diaphragm B carries'one of the contactelectrodes, F, at its center,and the other or complementary electrode, E, is attached to a spring, f,the free end of which is clamped by the lugs c and c. The spring is thusheld in place with the center of the electrode E in contact with thediaphragm-electrode F. The

initial pressure between the two electrodes is regulated or adjusted byan auxiliary spring, 0, which is riveted or solderedtothesuspendingspring f. This is bent down, as shown in Figs. 4 and 2, andtreads backwardly. 1f unbiased, it would extend backward so far as tostrike the bar D; but it is capable of being com;'

pressed by sliding the abutment h between-it and the said bar, theproper adjustment of the initial pressure being reached when the end ofthe spring rests about the middle of the abutment, as shown in Fig. 2.

To put the several parts together it is only necessary to hold theelectrode-spring f in place, to hook the axis 1 in the bend b, to holddown the lower forked end of the bar D, and then to turn the bolt 43 upon its pivot into the said forked end, screwing the nut j down thereon,asshown. Per contra, todismember the instrument, the nut j is to beunscrewed and the bolt 1' bent down, thus disengaging the bar D, whichmay then be unhooked and severed from the bent arm a; the spring f andelectrode E may now be released and drop out 5 it may then be repairedor be repolished 5 and the other electrode whiehvis fixed upon thediaphragm is also thus made'accessible.

The features which I have described may readily be applied to thestandard Blake transmitter, as I show in Figs. 5 and 6. In thosefigures, Bis the. diaphragm, and G' the ring seat or frame inwhich itis'placed. It is maintained in placeby the clamp I and thedamping-spring H. The upper part of the ring-seat G projects backwardlyfrom the diaphragm, terminating in the hook m. In this hook, which isalso forked, as shown more clearly in Fig. 5, the axis b of the bar D issuspended. The lower part of the bar D is forked, asin the foregoingdescription, and embraces the bolt 1', a

which is pivoted to the lower part of the ringseat. As in the ordinaryBlake transmitter, a platinum electrode, F, is carried on the end of alight spring, 6, and a carbon-button electrode, E, in contact with thesaid platinum, is suspended by-a heavierspring, f. The light spring eisinsulated from the ring-seat G bythe non-conducting block A: Thetwosprings are insulatedfrom one another by the nonconducting massq,.while.between the lugc of.

the'bar Dand the-springf the thirdnon-conducting block, 19, isinterposed. .All of these non-conducting blocks yare supported in i aframe, 0. The lug. c presses upon these blocks andholds themfirmlytogether, with the ends of the springs. between them; The normalpressure of. the electrodes is regulatedv by the screw 9. In both ofthese cases whichI have described the two electrodesare of coursesuitably connected with the circuitwires leading to and from a battery,and in some cases through the primaryeircuit ofan inductioncoil; butasthe electrical connections'have no bearing upon my invention, I havenot th ought it necessary to show and. describe them.

What I claim as my invention is- 1. The combination,;in abattery-telephone,

with a diaphragm, a; ring-seat: therefor, and

ed to compress and hold one or more springeleetrodes, and an adjustingdevice attached to the lever, substantially as and for the purposesdescribed.

2. The combination, in abattery-telephone, of the hereinbef re-describedmechanism, consisting of the hooked bracket m, the lever D,.

having an axis, b, adapted to be suspended in the said hook-bracket, andfurnished with the compressing-lug c and the adjusting-screw g,

and its supporting-frame, of thehinged bar on lever, the electrodespring or springs held in place by being clamped between said bar orlever and a stationary part of the frame, and

means for detachably securing the free end of said bar or lever to saidframe, substantially as described;

4. The combination, with the diaphragm, electrode, and spring supportingthe same, of a-sliding. wedgeshaped adjusting-piece for regulating thepressure of said spring, sub stantially as described.

is released the said parts may at once be removed, substantially asdescribed.

In testimony whereof I have signed my namev to this specification, inthe presence of two subscribing witnesses, this 1st day of June, 1883.

EDWARD L. WILSON. Witnesses:

Gno. WILLrs PIERCE, J. H. CHEEVER.

7 5. The combination of the frame, diaphragm, .bar or lever hinged atthe back of said frame, eleetrodespring, adjusting-piece on said bar

